The correct answer is that "t<span>roponin holds the tropomyosin in place on the actin".
In excitation-contraction coupling, tropomyosin prevents the interaction between actin and myosin in resting muscles. In the event of excitation, there is release of calcium from the sarcoplasmic reticulum wherein the troponin will bind this calcium and will release tropomyosin and expose myosin enabling it to attach to actin and therefore facilitating muscle contraction.</span>
D. because if you think about the dna is the same as thier genetic material/genes whatever you want to call it.
B, the centrioles
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The action of phagocytes doesn't happen at any certain temperature. No specific sort of lymphocyte is produced as a result of it. It doesn't react to any particular hormone.
The process of phagocytosis begins with attachment and ingestion of microbial particles into a bubblelike organelle called a phagosome. Once inside the phagocyte, the phagosome containing the microorganism joins with a lysosome, which contributes enzymes. The fusion of phagosome and lysosome results in a phagolysosome. Microorganisms are destroyed within minutes, and the microbial debris is eliminated from the cell in the process of egestion.
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D.) a unicellular organism that has a simple structure and is commonly found in human intestines.
